CONFIG_PRINTK_CALLER: Show caller information on printks

General informations

The Linux kernel configuration item CONFIG_PRINTK_CALLER:

• prompt: Show caller information on printks
• type: bool
• depends on: CONFIG_PRINTK
• defined in lib/Kconfig.debug
• found in Linux kernels: 5.1–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Selecting this option causes printk() to add a caller "thread id" (if in task context) or a caller "processor id" (if not in task context) to every message.

This option is intended for environments where multiple threads concurrently call printk() for many times, for it is difficult to interpret without knowing where these lines (or sometimes individual line which was divided into multiple lines due to race) came from.

Since toggling after boot makes the code racy, currently there is no option to enable/disable at the kernel command line parameter or sysfs interface.

Hardware

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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